I have an older mini laptop & I want to - Erase personal data for resale Acer Aspire D250-1165 (2000 MFG date)... It is mine had it for ages I believe since 2005. I don't have any key, liscence key, etc. I don't believe I have anything important, that is 'that old' I should even worry about but am still concerned. What can I do without any "keys" at this point? Also, I have no experience with this ever.